$\int_{-1}^2\left(x^2e^{4x}\right)dx$
$15a^2\left(a+1\right)^3-5a^2\left(a+1\right)^2$
$\left(x-3\right)\left(x-4\right)-\left(x+9\right)^2$
$-3-y$
$x\sqrt{4-y^2}dx+\sqrt{x^2+3}dy=0$
$4+5lnx\:=19$
$csc\theta\:+sin\theta\:=\frac{2-cos^2\theta\:}{sin\theta\:}$
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